The argument from design claims that the universe is so complex, more so than even the most complex of human creations, that it can only have been created by a designer with a higher level of intelligence than humanity. The argument from design therefore relies heavily on an analogy between human made objects and naturally occurring objects, and it is this analogy which has been heavily criticised. Hume (1947:150), for example, argues that it is entirely false to compare human objects with the universe, because while we have experience of the processes of human created objects, we have no experience of how universes are created because the universe is singularly unique. We can therefore quite comfortable argue that certain objects have been created through intelligent design (such as houses), because we have experience of their creation. We have absolutely no experience of how the universe is created however, nor naturally occurring objects such as the human eye. It is therefore pure conjecture to argue that the universe has been created through intelligent design, as we cannot possibly know this from experience. The argument from design is therefore invalid for Hume because its analogy between human made objects and the universe is impossible to verify and remains completely conjectural.